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Does indoor or outdoor units either one come on/
Lets start by checking breaker at indoor unit and make sure it is on.If everything is outside,check breaker there. Then give me model an ac unit
OK everything is controlled by the indoor unit. Do you have a volt meter to troubleshoot and can you open the indoor unit to expose wiring?
Give me model on indoor unit
Not thermostat but air handler. Your thermostat has batteries so it will give us display and show on even if we have no power to unit. If you can give me model on indoor air handler or furnace I will tell you where to look for a possible small fuse in unit that may be blown.
Usually in a closet,basement or attic.If you can find the return where you replace filter, follow that and it will take you to unit
NO it will be a large grille where air goes into unit
Air handler we are looking for will be similar to this
Yes lets remove panel and then send me another pic inside
Great now remove screws and remove this panel
OK do you see a fuse in the section on right side (Thermostat wiring 24v)?
Pull those wires out where I can see them
OK does not like you have a fuse. Next step will be to check voltage
. If you have a meter let me know .If not you can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.
It will be in tool section at Walmart. Depends on what we find as to what has to be replaced.If no power to unit, maybe a breaker.If power to unit but not out of transformer may be transformer.
By the way have you checked all of your circuit breakers? We could just have a breaker off or tripped.
They all appear ON. I thing next we should get the meter and go to air handler. Remove the little cover and verify we are getting power at the air handler.
Start by opening the little junction box in air handler. Set meter to ac volts )lowest setting above 120 )Remove wire nuts (being careful not to touch wires together or to cabinet and check between th white and black for power
Going to eat but will be back in office shortly.This junction box I am referring to